The aim of our study is to evaluate the effect of gabapentin and memantine on the mean velocity, amplitude and frequency of pendular nystagmus, as well as on oscillopsia, visual acuity and vision-specific health-related quality of life score, in 10 patients with multiple sclerosis. The primary object is to find out the best variable to evaluate the efficiency of nystagmus treatment and the secondary, to compare the efficiency of both gabapentin and memantine in a common population of patients.